| 548 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| * | DD | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4} |
| 100 | DF | .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18} |
| 356.1 | DF | .~.~.~ 1,2-diazoles (including hydrogenated) {8} |
| 358.1 | DF | .~.~.~.~ Polycyclo ring system having the diazole ring as one of the cyclos {3} |
| 360.1 | DF | .~.~.~.~.~ Bicyclo ring system having the diazole ring as one of the cyclos (e.g., 2, 4-dichloro-5-nitrophenyl-4,5,6,7-tetrahydro-2H-indazole, etc.) {3} |
| 361.1 | DF | .~.~.~.~.~.~ The other ring is a benzene ring {3} |
| 362.1 |  | .~.~.~.~.~.~.~ Nitrogen attached directly to the diazole ring by nonionic bonding |